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Chapter 4 – Voice Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 116
Command: +VDR=<enable>,<report> Enable/Disable Distinctive Ring (Ring Cadence
Reporting)
Values: See the Description
Result Codes: OK if the modem accepts the command; ERROR if the parameter is out of range.
Description: The +VDR command causes the modem to enable or disable reporting of the ring
cadence information, and to control the timing of the Ring event code report if ring
cadence reporting is enabled.
This report format is one line per silence period, and one line per ring period. The length
of the silence period is in the form DROF=<number in units of 0.1 seconds><CR><LF>,
and the length of the ring in the form DRON=<number in units of 0.1 seconds>. The
<LR> character is optional. The modem may produce a Ring event code after the DRON
message if enabled by the <report> parameter. The <report> parameter should be set to
a value larger than the expected off-times within a single pattern so that the Ring event
reports are issued only during the off-times between the complex patterns.
<enable>
<report> Description
0 N/A The modem will not generate ring cadence reports. Other call
progress event codes (including Ring) are reported as normal.
1 0 The modem only produces DROF and DRON messages. Other
call progress result codes (including RING) are reported as normal.
1 non-zero The modem only produces DROF and DRON messages. The
RING result code is displayed after the falling edge of the ring
pulse (i.e., after the DRON report).
2–255 non-zero Reserved for future standards.
Example: The lines below shows a cadence with an off time of 4.0 seconds, an on time
of 0.8 seconds, an off time of 0.4 seconds, and an on time of 0.8 seconds. The RING
result code is displayed 0.5 seconds after the last DRON message. The command to
enable this sample sequence is +VDR-1,5 , as shown below:
<DLE><X>
DROF=40
DRON=8
DROF=4
DRON=8
RING
<DLE><.>
<DLE><X>
DROF=40
DRON=8
DROF=4
DRON=8
RING
<DLE><.>